Scaffolding-bracket.



E. M. CLARK.

SCAFFOLDING BRACKET.

APPLICATION FILED MAR. 13, 1912.

Patented Oct. 21,1913.

l llL Qxmmeooao c LUMBIA PLANOGRAPH CO.,WASHINUTON. D. c.

EDGAR M. CLARK, F DAYTON, OHIO.

SCAFFOLDING-BBACKET.

Specification of Letters Patent.

Patented Oct. 21, 1913.

Application filed. March 18, 1912. Serial No. 684,377.

To all whom it may concern Be it known that I, EDGAR M. CLARK, a

I citizen of the United States, residing at Dayton, in the county of Montgomery and V plurality of gripping devices, all of which will be moved into operative engagement with the shingles by the thrust of the scaffold; and further to provide such a device in which two gripping devices are so arranged that one will prevent the other from being moved over its center into an inoperative position.

In the accompanying drawings, Figure l is a perspective view of my invention showing the same applied to a roof; and Fig. 2 is a sectional view taken centrally through the device and also showing the same applied to the shingles of a roof.

In these drawings I have illustrated one embodiment of my invention and have shown the same as comprising a base plate 1 adapted to be slipped beneath the lower edge of a shingle. Rigidly secured to the lower or rear edge of the base plate on each side thereof are upwardly and forwardly extending arms 2, the forward ends of which project some distance beyond the lower end of the shingle when the device is in operative relation thereto.

Pivotally supported by the forward ends of the arms 2 is a clamping device which comprises a plate 3 having its lower edge serrated to form teeth a and provided with rearwardly extending arms 5 by means of which it is mounted on a shaft 6 which, in turn, is mounted in the arms 2. The plate 3 is preferably curved forwardly and upwardly so that its upper end 7 projects some distance beyond its lower end and will be engaged by the scantling or other timber comprising the scafiold. It will be noted that distance below its pivotal center. By moving the plate about its pivotal center this edge can be moved away from the base plate 1 to permit the latter to be placed beneath the shingle. When the base plate is in position with reference to the shingle the movement of the clamping plate 3 about the shaft 6 will cause the serrated edge thereof to engage the shingle and exert a gripping action thereon. The weight of the timber forming the scaffold will come againstthe upper edge of the clamping plate 7 and will tend to thrust the teeth farther into the shingle, thus increasing the gripping action of the device with the increase of the weight on the scaffold.

The clamping plate preferably has connected therewith a secondary gripping device which extends rearwardly and downwardly to grip the shingle upon which the base plate 1 rests. In the present form of the device the arms 5 by means of which the plate is mounted on the shaft 6 are eX- tended rearwardly to a point beyond the rear end of the base plate and the rear ends of these arms are curved downward and pointed to cause them to engage the shingle upon which the base plate rests when the clamping plate has been moved into operative engagement with the shingle beneath which the base plate has been thrust. The thrust of the timber forming the scaffold against the upper edge of the clamping plate serves to thrust the points of the arms 5 into the roof as well as to thrust the serrated edge of the plate into the roof. Moreover, these arms constitute guards which efli'ectually prevent the thrust on the upper edge of the clamping plate from throwing the same over its pivotal center and thus moving the serrated edge of that plate out of en gagement with the shingle or loosening its grip on the shingle. These arms also form actuating devices for the clamping plate which can be readily grasped to move the clamping plate about its pivotal center.

The whole device is of a very simple character, can be built at low cost and is of a very strong durable character. Moreover, the device is provided with two gripping devices, the gripping action of both of which is increased by any increased weight on the scaffold. The secondary gripping device constitutes a guard to prevent the overthrow the serrated edge of the plate 3 extends some i of themain gripping device and also serves as an actuating device for the main clamping plate.

While I have shown and described one embodiment of my invention it will be understood that this has been chosen for the purposes of illustration only and that I do not desire to be limited to the details of construction shown and described, for ob Vious modifications will occur to a person skilled in the art.

Having thus fully described my invention, 1 what I claim as new and desire to secure by 1 Letters Patent, is

1. In a scaitold bracket, the combination, 1 with a base-plate, of spaced brackets se-= cured to said plate adjacent the side edges thereof, longitudinally disposed arms each= fulcrumed adjacent one end upon a respec tive bracket, the longer end of each arm forming shinglegripping means, and a transversely disposed plate rigidly connect- 1 ed to the shorter ends of the arms, and bel ing disposed in an obtuse plane with respect to the plane of the base-plate whereby pressure exerted in one direction upon the upper portion thereof will cause the:

longer ends of the arms to be forced downwardly.

2. In a scaffold bracket, the combination,

with a base-plate, of spaced brackets se- I a the plane of the base-plate whereby pressure exerted in one direction upon. the upper portion thereof will cause the longer ends of the arms to be forced downwardly, said plate extending below the fulcrum out the arms and having its lower edge serrated to form a gripping element.

In testimony whereof, I my signa ture in presence of two witnesses.

EDGAR M. CLARK.

lVitnesses HARRIET L. HAMMAKER,

L. W. James.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

